Calculator



FIG. 1 is a perspective view of the calculator.

FIG. 2 is a front view thereof.

FIG. 3 is a back view thereof.

FIG. 4 is a bottom view thereof; and,

FIG. 5 is a left and right side view thereof.

The words MARKSMAN, PF PRODUCT, and REGISTERED DESIGN are not claimed as a feature of the mark. The numerals appearing on the display screen are not part of the design. 

The ornamental design for calculator, as shown and described. 